99 STS trans fluid
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS trans fluid in Past Cadillac Vehicle Discussion; which should i use, ours is a little low and i want to top it up with the correct fluid, ...
  1. #1
    crimson_pearl is offline Cadillac Owners Member
    Join Date
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    99 STS trans fluid

    which should i use, ours is a little low and i want to top it up with the correct fluid, i presume its not what my BMW 3 series uses?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 99 STS trans fluid

    Dexron III.
    I think GM now has a Dexron IIII or V (can't remember which) but it is compatable.

  4. #3
    Zorb750 is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Eldorado
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    Re: 99 STS trans fluid

    There's a Dex 4, but it's only at dealers as far as I know, and it's also expensive. They claim it's one of those "Lifetime" fluids. If your BMW 3 series has a GM Hydramatic trans, you can use the BMW fluid. If it's the ZF, you can't. I mean you could flush out all the Dexron fluid in your Cadillac and convert to Esso LT71141, but at $20-30/L... I wouldn't. Just so you know, do not EVER put GM Dexron in a BMW that doesn't use it. There's a TSB for the E38 7 series regarding transmission malfunction eventually leading to failure resulting from the installation of GM trans fluid, even as a top off. It's somehow not compatible with BMW's ZF transmission clutch material.

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